I am raplacing the floor in a trailer at work and i have some flush flooring screws that you just drill straight through the flooring and into the metal chassis with.

They have a 5mm square hole in the head for driving with.

Anyone any ideas where i can get a bit to suit it?

Thanks

They're called square recess insert bits, a lot of the cheap box sets have them in.

They are called Robertson screws interesting history.
http://en.wikipedia.org/wiki/Robertson_screwdriver

This set claims to have some square bits, but I can't see what sizes.
http://www.screwfix.com/prods/15297/Screwdriver-Bits/Standard-Bits/All-Purpose-Screwdriver-Bit-Set-100Pc#

Hi

Most good electrical stockest will have screw drivers to fit these, the most comom brand for these screwdrivers is screwlux, as sold by the CEF (city electrical group)

[Edited on 23/5/08 by madrallysport]